BS EN 60255-127:2014
$142.49
Measuring relays and protection equipment – Functional requirements for over/under voltage protection
| Published By | Publication Date | Number of Pages |
| BSI | 2014 | 28 |
This part of IEC 60255 specifies minimum requirements for over/under voltage relays. The standard includes specification of the protection function, measurement characteristics and time delay characteristics.
This standard defines the influencing factors that affect the accuracy under steady state conditions and performance characteristics during dynamic conditions. The test methodologies for verifying performance characteristics and accuracy are also included in this standard.
The over/under voltage functions covered by this standard are as follows:
The general requirements for measuring relays and protection equipment are specified in IEC 60255-1.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Annex ZA (normative) Normative references to international publications with their corresponding European publications |
| 6 | English CONTENTS |
| 8 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Specification of the function 4.1 General 4.2 Input energising quantities/Energising quantities Figures Figure 1 – Simplified protection function block diagram |
| 11 | 4.3 Binary input signals 4.4 Functional logic Figure 2 – Overvoltage independent time characteristic |
| 12 | Figure 3 – Undervoltage independent time characteristic |
| 13 | Figure 4 – Dependent time characteristic for overvoltage protection |
| 14 | Figure 5 – Dependent time characteristic for undervoltage protection |
| 16 | 4.5 Binary output signals Figure 6 – Definite time reset characteristic Figure 7 – Definite time reset characteristic (alternative solution with instantaneous reset after relay operation) |
| 17 | 5 Performance specification 5.1 Accuracy related to the characteristic quantity 5.2 Accuracy related to the operate time |
| 18 | 5.3 Accuracy related to the reset time 5.4 Transient performance 5.5 Voltage transformer requirements 6 Functional test methodology 6.1 General |
| 19 | 6.2 Determination of steady state errors related to the characteristic quantity |
| 20 | 6.3 Determination of steady state errors related to the start and operate time |
| 21 | 6.4 Determination of steady state errors related to the reset time Tables Table 1 – Test points for overvoltage elements Table 2 – Test points for undervoltage elements |
| 22 | 6.5 Determination of transient performance Table 3 – Test points for overvoltage elements Table 4 – Test points for undervoltage elements |
| 23 | 7 Documentation requirements 7.1 Type test report Figure 8 – Test waveform Table 5 – Recommended values for the test |
| 24 | 7.2 Other user documentation |
| 25 | Annex A (informative) Reset time determination for relays with trip output only Figure A.1 – Dependent reset time determination |
| 26 | Bibliography |
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BS EN 60255-127:2014
Measuring relays and protection equipment – Functional requirements for over/under voltage protection Published By Publication…
